Tire-valve.



-C. LDORFFf HRS VALVE. APPLICATION film our. 1e. 19%:

1,207,882. Pafeilted Dec. 12,1916.

STATES PATENT Omar;

CONRAD J. DOB/FF, OF CHICAGO, ILLINOIS.

TIRE-VALfE.

3 and a resident of Chicago, in the county of (Tool: and State of Illinois, have invented certain new and useful Improvements in TireTVa-lves, of which the following is a specification. 4

.Thi's ,invention relates to that type of safety valves for pneumatic t1res in which a mechanism operating under a predetermine-d pressure is'adapted to open a blowoh? and permit an escape of excess pressure.

-'ments. I cup-shape spring or abutment plate for the And the present improvement has for its 1- object to provide :1 simple and efficient structural, formation and combination of parts in .21.;p1essu1e actuated mechanism of a. tire valve, adapted to provide a sensitive and ac- ,curetepperation with an avoidance of ex- "cess friction, all as will hereinafter more fully appear.

- {Ingthe accompanying drawings: Figure 1, is'an enlarged central section of a blow-off tire valve embodying the present improve- Fig. 2, is a plan view of the main expansion casing of the structure.

Similar reference numerals indicate like pert's in both views.

' Referring to the drawing, 1 designates the .cu shape base member of the mechanis'm o'rmed at its lower end with a co upling neck 2 upon which is revolubly mounted a coupling sleeve 3 adapted for screw-threaded engagement with the outer end of the usual filling tube or nipple of a pneumatic tire.

4L1 desigmites an open top main upper cheniberformed in the expanded upper portion'vof the base member 1, for the reception ofjthe expansion member hereinafter de scribed;

5' designates an intermediate sub-chamber jormed n-thebase member 1, beneath the j'afo'rc' seid main chambers, and adapted to receive gn'd. forn1 a support for the station .a.ry"abi 1tment member of the expansion vlmeir'iberiebove referred to.

fiiidesignates a lower chamber or shoul "ilere'd counter bore formed in the base member lb low the, sub-chamber 5 and adapted to receive the hereinafter described tubular ;and,..sho'u1dered .nip'ple by which the statio'n'e' .I-abutment member, above referred mi s uredi place.

7 designate laterally disposed valv Specification of Letters Patent.

casing screwing into a side of the base. member 1, with its central bore communicating'by a branch passage 8 with the subchamber 5, above described.

9 designates a check valve, preferably of the type known to the trade as the Schraedcr valve, zmd disposed in the usual manner in the valve casing 7, to prevent a reflux of the air used in filling the pneumatic tire.

1O designates the upper housing of the casing of the present tire valve, formed with an expanded lower portion adapted to screw onto the upper end of the base member 1 and form a closure for the upper end of the main chamber 4 of said base member.

11 u designates an elongated chamber formed in the housing 10, its upper end being provided with a closure cap 12 and with an internally screwthreadd portion 13 for the attachment of the adjustable abutment collar hereinafter described.

1 1: designates apessage or orifice at the lower end of the chamber 11, connectingthe same with the aforesaid chamber 4: or the base member 1.

15 designates a laterally extending neck on the housing 10, adapted to contain a visible pressure indicating mechanism, when such mechanism is desired in connection with the present blow-off mechanism and actuated thereby. No claim to novelty is made in the present case to such provision and accordingly the same is neither shown or described in detail.

16 and 1 7 designate upper and lower flexible pistons or diaphragms, preferably formed by a pair of reversely arr; nged cups'haped members, the marginal meeting edges of which are formed with out turned flanges 18 over Which is sn aged an annular coupling band 19 of a channel form in cross-section, to secure the two members together in an air tight manner. With the described construction, a chamber is formed Patented Dec. 12, 1.916. Application filed October 16 1915. Serial No. 56,175.

Between the diaphragms 16, 17, adapted to heceive air from the tire 'and at the pressure prevaahng therein, and so. that the diaphragms will have movement to and from- "of thesame. 21 designates the stationary abutment member of the lower diaphragm 17, formed with. a convex upper bearing surface for central orifice 23 coinn'mnicating with the 22," adapted to pass through a central ori. co

in said diaphragm and its reinforcing disk 20, and be swagcd thereover as shown. Said abutment member is also pro ided with a interior of the chai'uber between the dia phragms 16, 17, above described, and adapt ed to introduce a pressure of a' into said chamber,

24 designates a depending tubular shank you the abutment member 2-1, fitting the aforesaid chamber 5 of the base meniber l and having a screw-tln'eaded central bore' adapted'for engagement with the attaching nipple hereinafter described. The usual ports or passages 25 are formed in the shank 24 to permit the passage of air between the branch passage i9, and the central bore of the shank 2d, and the interior of the pneumatic tire.

26 designates the tubular shouldered nipplcpabove referred to, and which is arranged in the lower; sub-chamber (i, aforesaid, and screws into the central bore oi the shank 24 ,to secure the stationary abutment memher fzl in place.

27 designates a radially slotted cupshaped'spring abutment member, the marginally slitted'portion of which has bearing against the under fa cc of the aforesaid housing 10, while its central portion has bearing association with the upper diaphragm 16. The function of said spring isto yicldingly force the aforesaid diaphragms 16, 17, to gether against air pressure normally pre vailing between said dia-phragms.

"2S designates a movable valve carrying head, having longitudinal movement in the chamber 11 of the [upper housing 10, and having guiding movement in bottom orifice 1d of said chamber, prcicrablyby meansof a lower expanded portion 2- as shown. Said valve carrying head is fixedly attached to the upper diaphragm l6 aforesaid, by a central. attaching nipple 30 passing. through-a: central orifice in said dia )hragm 16 and in the associated disks 20 and spring; member 27, and clenched against the inner of'said reinforcing disks 20, as shown.

31 designates the longitudinal bore or passage of the valve carrying head 28, ex-

tending from' end to end of said head and communicating at its'lower end with the chamber between the diaphragms 1G, 17, aforesaid. Said bore 31 is preferably of the stepped formation shown and is adapted to contain an inwardly opening spring actuated valve 32,-preferably of the well known Schraedcr type shown, with the stem 33 of said valve extending beyond the .end of the head 28, for automatic operation by means hereinafter described.

34 designates an externally screw-threaded abutment collar screwing into the screw-1 tl 1reade d upper portion 13 of the upper-j .such that as the valve carrying head 28,

moves upward under an excessive pressure in the tire, and as a predetermined pressure is reached, the valve stem 33 will contact with the screw 35 and the valve 32 forced open to permit an escape of an excess of air from the tire.

36 designates an abutmentf'collar carried near the lower end of the valve carrying head 28, and forming the lower abutment for the auxiliary spring hereinafter de: scribed. As usual in the present type. of tire valves the collar 36 will have operative connection with the finger or pointer of the usual pressure indicating mechanism located in the lateral neck 15 of the housin'g .10, heretofore referred to.

37 designates an auxiliary spring disposed between the above described abutment collar 2-34 and 36, and acting as-an adjustable auxiliary to the main cup-shaped spring'27, heretofore described,in providing a resiliout resistance to an opening or blow-oil movement of the parts heretofore described.

Having thus fully described my said invention what I'claim as new and desire to secure by Letters Patent, is

1. In a tire valve, the, combination of a main casing adapted fol-attachment to the filling tube'of a. pneumatic tire and formed with an upper chamber and an intermediate main. chamber, an expansion member arranged in the aforesaid main chamber and comprising: upper and lower diaphragms connected together by an annular marginal wall, a dished spring having central bearing on the upper diaphragm and marginal bearin in the main chamber aforesaid, a carrying head attached centrally to said spring and upper diaphragm and moving therewith, an inwardly opening check valve arranged in said carrying head and provided with an axially arranged stem, and an abutment for said valve stem associated with the main casing, substantially as set forth.

2. In a. tire valve, the combination of a main casing adapted for attachment to the filling tube of a pneumatic tire and formed with an upper chamber and an intermediate main chamber, anexpansion memljer arranged in .the aforesaid main chamber and adapted under varying pressures to have movementin an outward directioma carrying head attached to said expansion member and movingtherewith, an inwardly opening check alve arranged in said carryinghead and provided with an axially arranged stein, an externally screw-threaded abutment collar engagin n screw-threw], fornmtio'n of the upper-climber of the main casing and formed for guiding engz'rgement with the outer end of the carrying head aforesaid, an abutment screw arranged in said abutment collar in axial alinement with the valve stem aforesaid, and a spring encircling the cnrr v ing heard and having been. on its lower end on said head. and at its upper end against said abutment collar, sulistuntinllyas set forth.

3. In a tire valve, the combination of a. main casing adapted for nttuchment to the filling tube of a pneumatic tire and formed with an upper-chem her and .nn intermediate carrying head and upper diaphragm in a downward direction, substantially as set forth.

4. In a tire valve, the combination of a main casing adapted for attachment to the filling tube of a pneumatic tire, a pair of dia-pliragms arranged in said casing and connected together to form a pressure recciving chzunher, an abutment member a tnehed to the lowermost diaphragm aforesaid, a hollow shouldered nipple attaching said abutment member in place, a. cupsheped abutment spring associated with the uppermost diaphragm aforesaid, a movable valve carrying head connected to said uppermost diz'zphrz igin and provided with an uhufl inent collar near its lower end, an inwardly opening check valve in said carrying head, an adjustable abutment collar arranged in the upper part of the main casing and having guiding engagement with the valve carrying head aforesaid, an adjustable abutxnent screw arranged in said abutment collar in longitudinal nlinement with the aforesaid inwardly opening valve, and :i spring arranged between the aforesaid abntn'ient collars, substantially as set forth.

Signed at Chicago, Illinois, this 12th day of October, 1915.

CONRAD J. DOBFF. 

